General Electric Co. · General Electric Co. · leaf 56
Form E 15 Form D 20 Form F 4 The Forms D 20 and D 21 Transformers are air-insulated. The D 20 Transformers are usedon circuits up to and including 7500 volts; D 21 from 7500 to 15000 volts; Form E 15 which isof the bus-bar type is for use on circuits not greater than 6600 volts. The Form F 4 is…
